Labconco Biological Safety Cabinets 34608 Series - Manual (Page 29)

Chapter 5: Using The Cabinet
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Sash is too high
The sash is open too far for safe operation.
Airflow Alert
The airflow patterns in the cabinet have changed, resulting in a sudden
change in the motor speed. This is most likely due to a blockage of the
grille or the exhaust filter outlet. It may also be caused by removal of the
work surface while the cabinet is in operation.
System Error
The motor and display circuit board are not communicating properly.
DO NOT USE THE CABINET UNTIL THE PROBLEM HAS BEEN
CORRECTED.
Data Area
The Data Area displays the Filter Gauge. This bar graph displays the percent
of remaining filter life. When the cabinet is new, or after the HEPA filters are
replaced, the gauge will be “full”, or display approximately 100%. As the
filters load, or if the grille or exhaust discharge are blocked, the bar graph
will show a reduced filter life.
The graph is user-selectable as a bar graph with percentage displayed, a bar
graph only, or a semi-circular graph showing filter life remaining.
Various factors such as temporary obstructions to airflow, temperature and
barometric pressure can cause the displayed percentage to vary slightly.
Ignore short term changes in the Filer Gauge’s value. As the Filter Gauge
approaches 20% remaining capacity, consider having the cabinet filter
replaced.
When the optional airflow sensor is installed and calibrated, the inflow and
calculated downflow velocities are also displayed during operation.
Icon Area
The Icon Area displays icons for those features selected or in operation. The
Icons are:
Normal blower operation –
In this mode the cabinet blower is operating normally.
Night-Smart TM blower operation
When Night-Smart is selected, the blower slows to idle speed
when the sash is closed, to maintain the cleanliness of the air in
the work area. When the sash is opened, the blower resumes
normal operation.